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2D isometric MMORPG using the SDL framework. Daimonin offers a free public server at https://www.daimonin.org . A Unity client is also in active development.
Cooperative multiplayer graphical RPG and adventure game
Crossfire is a free, open-source, cooperative multi-player RPG and adventure game. Since its initial release, Crossfire has grown to encompass over 150 monsters, 3000 areas to explore, an elaborate magic system, 14 races, 16 character classes, and many powerful artifacts scattered far and wide. Set in a fantastical medieval world, it blends the style of Gauntlet, NetHack, Moria, and Angband.
0 A.D. is a free, open-source, cross-platform real-time strategy game.
0 A.D. (pronounced "zero ey-dee") is a cross-platform real-time strategy (RTS) game of ancient warfare. It's a historically-based war/economy game that allows players to relive or rewrite the history of ancient civilizations, each depicted at their peak of economic growth and military prowess.
Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.
WW2 Combat Flight Simulator. Free. Current Version: 9.88. This is now the world's leading open-source combat flight sim for LINUX.
Linux Air Combat ("LAC") runs on almost any desktop LINUX system (even Steam Deck & Raspberry Pi) and generates smooth, high-performance flight.
If it runs TOO fast on your hardware (framerates beyond 100 FPS), you should activate LAC's built-in FrameRate Limiter as documented...
...It forked from (no longer maintained) RTS classic Glest in 2010 and has since added several new features while improving on previously existing ones.
MegaGlest is available for Linux, Windows, OS X and other systems. It also drives ot
OpenSource OpenGL Multiplayer Multiplatform Battle Zone capture the Flag. 3D first person tank game.
Download the latest version at https://www.bzflag.org/downloads/
Development has moved to Github: https://github.com/BZFlag-Dev/bzflag
(The SourceForge binary releases for Windows and macOS are very outdated. Please download the latest version from our website.)
Mac Crack Attack is a port of Crack Attack to the Mac OS X platform. Crack Attack is based on the Super Nintendo classic Tetris Attack. Mac Crack Attack is a fast paced "Tetris-like" game for one or two players (networked)
TChess is an extended chess played on a Torus (donut) It includes a computer player (KI) with 3 strength levels and multiplayer support. -- Please post your questions in the Help-Forum!
OpenJazz is an open-source version of the classic Jazz Jackrabbit™ games. OpenJazz is available for a wide range of platforms, including Windows, Mac OS X, and several gaming devices. To play, you will need the files from one of the original games.
This is a 2D shooting action game for two players for GNU/Linux, Mac OS X, and Windows. Current release written in C++ using the SDL library with its extensions. Next release will be in Java.
This is a basic client/server game in DirectX featuring up to 16 simultaneous players moving around a flat sheet of grass as skinned/animated .X meshes (the Tiny model from Microsoft demos) in only about 3500 lines of code.